500 Error when trying to call a program with a service program

I'm stumped.
I have a CGI ILE program (Websmart) that I just added a service program call to.
When I call the program via the URL it executes correctly.On a form I have two ajax calls - the first gets a description of an item.  It executes correctly.The second gets a status so that I can then determine whether or not additional data needs to be collected.This second ajax call fails - I get a 500 error and in the apache error log I see a line to see the joblog.
When I look at the job log I see a QZSRHTTPTR file.  And the job log includes:
Message . . . . :   Cannot resolve to object ITMCHNGSRV. Type and Subtype 
  X'0203' Authority X'0000'.                                              
This is my service program.
We use IBM authorization in our Apache Config.  And to confuse matters further we have used WEBSMART ILE for years.  We are now adding PHP to the mix.  We recently changed our apache configuration to use both.  I don't know if we whacked something in the config or if this is just a red herring???
My guess is that the program is somehow being executed different on the second ajax call - but I'm unsure how to verify this.
Any thoughts?Thanks.Vicki Wilson